282 



5. Arius leiotetocephalus Blkr. 



Arius leiotetocephalus Bleeker, Nat. & Geneesk. Arch. Ned. Ind. Ill (2). 1846, 



p. 292. 



Arius Meyenii Miiller & Troschel, Horae Ichth. III. 1849, P- 9- 

 Ariodes leiocephalus Bleeker, Ichth. Arch. Ind. Prodr. I Siluri, 1858, p. 88. 



Atl. Ichth. II. 1862, p. 40. 

 Arius liocephalus Gunther, Cat. Brit. Mus. V. 1864, p. 165. 



B. 6; D. i. 7; A. 1517; P. 1. 12 1.13; V. 6. 

 Elongate, height 4 2 / 3 S 1 /^ head 3 1 / 5 3 2 / 3 > broader than 

 high, its width about i 1 ^ in its length, nearly smooth above; 

 occipital process granular, smooth in young specimens, ovate, 

 ! 2 / 5 times longer than broad, mesially with a longitudinal 

 elevation, touching the short and narrow basal bone of dorsal 

 spine. A narrow median fontanel ending before the occipital 

 process reaching to the snout. Dorsal profile sloping down to 

 the conical rounded, slightly prominent snout. Humeral process 

 triangular, smooth. Eye 7 (in a specimen of 315 mm.), with 

 a free orbital margin, situated in the middle of the head, 

 more than 3 times in the interorbital space. Maxillary barbels 

 reaching hindborder of gillmembrane, mandibulary barbels not 

 so far, mental ones still shorter. Dorsal fin about as high as 

 body, its strong spine granulated anteriorly, posteriorly nearly 

 smooth, 2 / 3 or 3 / 4 of the length of the head. Adipose fin small, 

 its base about */ 2 of that of the soft dorsal and more than 

 6 times in its distance from that fin, above the posterior half 

 of the anal, the free border of which is concave. 

 Ventrals extending to the origin of the anal, ! / 3 

 of length of pectorals, which are about as long 

 as head without snout, their flattened spine 

 serrated on both sides, about as long that of 

 the dorsal. Caudal deeply incised, its lobes 

 pointed. Teeth in the jaws in a villiform, 

 arcuate band, on the palate granular, in 2 small, 

 widely separate anterior patches and in two 

 long, oval posterior ones, which posteriorly end 

 in two narrow diverging points. a stiff, flattened 



Fig. 112. Anus 



leiotetocephalus Blkr. short gillrakers. Brownish dark above, whitish 

 Teeth of upper jaw below. Fins yellowish, dorsal with a dark point. 



and palate */.. T ,. 



Length to 470 mm. 

 Nomen in dig. : Ikan manjong tonggol. 



